שמות ג:ד פירוש: רשב״ם, ספורנו, אור החיים וטור הארוך

וירא ה', the angel, who is called “G’d,” seeing he is carrying out G’d’s assignment.

וירא ה' כי סר לראות, When G’d saw that Moses took a deeper interest in the phenomenon,

ויאמר הנני, he said: "I am ready." This was different from the time G'd first called out to the prophet Samuel (Samuel I, 3,4) when Samuel thought that the High Priest Eli had called him. Moses knew right away that G'd was speaking to him. This was because Moses was a prophet already from birth; this was merely his first vision. On the other hand, perhaps the words את המראה הגדול הזה "this great spectacle," merely indicates that compared to previous contacts between G'd and Moses this one seemed infinitely more remarkable.